TWI533728B - An electronic device and noise cancellation method - Google Patents

Description

Electronic device and noise filtering method

The present invention relates to an electronic device, and more particularly to an electronic device and noise filtering method for noise interference caused by a device suitable for USB 3.0.

In general, electronic devices conforming to the USB 3.0 specification have been widely used, such as notebook computers, desktop computers, and various portable storage devices. However, the electronic device conforming to the USB 3.0 specification operates at an operating frequency of 5 Gbps, operates at a fundamental frequency of about 2.5 GHz, and also increases background noise of 2.4 GHz to 2.5 GHz. Therefore, if the electronic device simultaneously performs wireless communication operations with a frequency of 2.4G to 2.5GHz, such as WiFi or Bluetooth communication, it will be interfered by the signal of the high frequency operation of USB3.0, due to the increase of noise, The signal noise ratio (SNR) drops, causing problems such as distortion of the received signal and a drop in signal flow. Therefore, a new solution is needed to filter out the noise interference caused by the high frequency operation of USB 3.0.

The purpose of the present invention is to solve the noise interference caused by the high frequency operation of USB3.0. The electronic device provided by the present invention subtracts a predetermined synchronization preamble from the received baseband signal to obtain a noise estimation signal. Then subtract the noise Estimate the signal to filter out the noise caused by the high frequency operation of USB3.0. Therefore, the present invention is capable of filtering out noise and reducing signal distortion.

The invention provides an electronic device comprising a coupler, a noise estimation device and a combination unit, wherein the coupler is configured to receive a baseband signal; the noise estimation device is configured to receive the baseband signal and subtract the baseband signal a preset synchronization preamble to obtain a noise estimation signal, wherein the preset synchronization preamble conforms to a transmission signal of an IEEE 802.11bg specification and/or an IEEE 802.11n specification; the combining unit is configured to receive a baseband signal, and The fundamental frequency signal is subtracted from the noise estimation signal to obtain an output signal.

The present invention provides a noise filtering method, which is applied to an electronic device. The noise filtering method includes receiving a baseband signal, and subtracting a preset synchronization preamble from the baseband signal to obtain a noise estimation signal. The preset synchronization preamble conforms to the IEEE 802.11bg specification and/or the IEEE 802.11n specification transmission signal; and the baseband signal is subtracted from the noise estimation signal to obtain an output signal.

100‧‧‧Electronic devices

101‧‧‧ Coupler

102‧‧‧ Noise Estimation Device

103‧‧‧Combination unit

104‧‧‧Detection device

105‧‧‧Antenna

106‧‧‧Low noise amplifier

107‧‧‧down converter

108‧‧‧ clock generator

109‧‧‧Automatic Gain Controller

110‧‧‧Demodulation transformer

Cb‧‧‧ fundamental frequency signal

Cn‧‧‧ noise estimation signal

Cr‧‧‧First RF signal

Co‧‧‧ output signal

Ci‧‧‧second RF signal

Cog‧‧‧ output gain signal

En‧‧‧Enable signal

S301-S304‧‧‧Steps

1 is a schematic diagram of an electronic device provided by the present invention; FIG. 2 is another schematic diagram of an electronic device provided by the present invention; and FIG. 3 is a flow chart of a noise filtering method provided by the present invention.

The apparatus and method of use of various embodiments of the present invention are discussed in detail below. However, it is to be noted that many of the possible inventive concepts provided by the present invention can be implemented in various specific ranges. These specific examples are only intended to illustrate the apparatus and methods of use of the present disclosure, but are not intended to limit the scope of the invention.

Figure 1 is a schematic view of an electronic device provided by the present invention. As shown in FIG. 1 , the electronic device 100 includes a coupler 101 , a noise estimation device 102 , a combination unit 103 , a detection device 104 , an antenna 105 , a Low Noise Amplifier (LNA) 106 , and a down converter . A down converter 107, a clock generator 108, an automatic gain controller (AGC) 109, and a demodulation transformer 110. Generally, the electronic device 100 can be an electronic device such as a desktop computer, a notebook computer, a server, or a router.

In one embodiment, a second RF signal Ci is received by the antenna 105 and transmitted to the low noise amplifier 106. The low noise amplifier 106 receives and amplifies the second RF signal Ci to generate a first RF signal Cr. Then, the down converter 107 receives the first radio frequency signal Cr and performs down-conversion to generate a baseband signal Cb. In another embodiment, the down converter 107 is coupled to a clock generator 108 and is down-converted according to the clock generated by the clock generator 108. In detail, the antenna 105 and the low noise amplifier 106 belong to the RF front end. Therefore, the second radio frequency signal Ci and the first radio frequency signal Cr all belong to a signal of a radio frequency band. The down converter 107 down-converts the first radio frequency signal Cr to a frequency band of 100 MHz to 200 Hz to generate a baseband signal Cb. In the embodiment of the present invention, the second radio frequency signal Ci and the first radio frequency signal Cr are radio frequency signals when performing WiFi communication or Bluetooth communication, but are not limited thereto.

The coupler 101 is configured to receive the baseband signal Cb, and the noise estimation device 102 is coupled to the coupler 101 to obtain the baseband signal Cb. In an embodiment, the coupler 101 transmits the received baseband signal Cb to the combining unit 103 and the noise estimating device 102, respectively. It is worth noting that the combining unit 103 is an adder or A subtractor. In another embodiment, the noise estimation device 102 is coupled to the coupler 101 such that the noise estimation device 102 generates a second baseband signal (not shown) corresponding to one of the baseband signals Cb. It should be noted that when the amplitude of the baseband signal Cb or the second fundamental signal obtained by the noise estimating device 102 is too small, the noise estimating device 102 may include an amplifier to amplify the baseband signal Cb or the second fundamental frequency. signal.

In addition, after obtaining the baseband signal Cb or the second fundamental frequency signal, the noise estimation device 102 subtracts a predetermined sync pattern (predetermined sync pattern, sync filed,) from the baseband signal Cb or the second baseband signal. Preamble) to obtain a noise estimation signal Cn. It is worth noting that the preset sync preamble is a transmission signal conforming to the IEEE 802.11bg specification or the IEEE 802.11n specification. The preset synchronization preamble is used to synchronize the electronic device 100 and the base station for wireless communication transmission. In detail, the electronic device 100 calibrates the transmission frequency, phase and clock using a preset synchronization preamble, and estimates the power required to receive the signal. Then, the combining unit 103 receives the noise estimation signal Cn, and subtracts the noise estimation signal Cn from the fundamental frequency signal Cb to obtain an output signal Co. Therefore, at this time, the output signal Co has filtered out noise. Then, the automatic gain controller 109 receives the output signal Co to generate an output gain signal Cog to the demodulation transformer 110, wherein the demodulation transformer 110 can be an I/Q demodulation transformer. Since the output gain signal Cog has been amplified by the automatic gain controller 109, the demodulator 110 can demodulate the output gain signal Cog.

In another embodiment, the electronic device 100 further includes a detecting device 104 coupled to one of the noise estimating devices 102. The detecting device 104 is configured to determine whether the electronic device 100 is connected to an external device that conforms to one of the USB 3.0 standards. Electronic device When the 100 device is connected to the external device, the detecting device 104 transmits the coincidence signal En to the noise estimating device 102, so that the noise estimating device 102 subtracts the preset synchronization preamble from the baseband signal Cb to obtain the noise estimation. Signal Cn. That is to say, only when the noise estimation device 102 receives the enable signal En, the baseband signal Cb is subtracted from the preset synchronization preamble to obtain the noise estimation signal Cn. Therefore, the power consumption of the electronic device 100 can be saved, and the operation efficiency can be improved. In addition, the external device is a USB 3.0 standard storage device, or a mobile electronic device such as a mobile phone, a tablet computer, or a notebook computer.

FIG. 2 is another schematic diagram of the electronic device 100 provided by the present invention. The difference between Fig. 2 and Fig. 1 lies in the position of the automatic gain controller 109. As shown in FIG. 2, the automatic gain controller 109 is located between the down converter 107 and the coupler 101. Therefore, the down converter 107 will down-convert the first radio frequency signal Cr to generate a baseband signal, and the automatic gain controller 109 will amplify the baseband signal generated by the down-converter 107 as a baseband signal. Cb. Then, the coupler 101 receives the baseband signal Cb, and the subsequent noise estimation process is as described above, and therefore will not be described herein.

Figure 3 is a flow chart of the noise filtering method provided by the present invention. This method can be implemented in conjunction with the electronic device in Fig. 1 or Fig. 2, but is not limited thereto. First, in step S301, the detecting means 104 determines whether the electronic device 100 is connected to an external device conforming to the USB 3.0 standard. If yes, go to step S302; if no, go back to step S301. In step S302, the detecting device 104 transmits the enable signal En to the noise estimating device 102. Next, in step S303, the noise estimating device 102 subtracts the preset synchronization preamble from the baseband signal Cb to obtain a noise estimation signal Cn. Finally, in step S304, the combining unit 103 converts the baseband signal Cb. The noise estimation signal Cn is subtracted to obtain an output signal Co. In the embodiment of the present invention, the fundamental frequency signal is generated by frequency-reduction of the radio frequency signal when performing WiFi communication or Bluetooth communication, but is not limited thereto. It is worth noting that the preset sync preamble is a transmission signal conforming to the IEEE 802.11bg specification or the IEEE 802.11n specification. The preset synchronization preamble is used to synchronize the electronic device 100 and the base station for wireless communication transmission. In detail, the electronic device 100 calibrates the transmission frequency, phase and clock using a preset synchronization preamble, and estimates the power required to receive the signal.

It should be noted that the electronic devices according to the USB 3.0 specification enumerated in the present invention are for illustrative purposes and are not limiting, but RF electronic devices having an operating frequency of about 5 Gbps and/or causing signal interference to other electronic devices are The scope of the invention is disclosed.

The purpose of the present invention is to solve the noise interference caused by the high frequency operation of USB3.0. The electronic device provided by the present invention subtracts a predetermined synchronization preamble from the received baseband signal to obtain a noise estimation signal. Then, the electronic device subtracts the noise estimation signal to filter out the noise caused by the high frequency operation of the USB 3.0. Therefore, the present invention is capable of filtering out noise and reducing signal distortion.

The above is only the preferred embodiment of the present disclosure, and the scope of the disclosure is not limited thereto, that is, the simple equivalent changes and modifications made by the disclosure of the patent application scope and the description of the invention, All remain within the scope of this disclosure. In addition, any of the embodiments or advantages of the present disclosure are not required to achieve all of the objects or advantages or features disclosed in the present disclosure. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the disclosure.

100‧‧‧Electronic devices

101‧‧‧ Coupler

102‧‧‧ Noise Estimation Device

103‧‧‧Combination unit

104‧‧‧Detection device

105‧‧‧Antenna

106‧‧‧Low noise amplifier

107‧‧‧down converter

108‧‧‧ clock generator

109‧‧‧Automatic Gain Controller

110‧‧‧Demodulation transformer

Cb‧‧‧ fundamental frequency signal

Cn‧‧‧ noise estimation signal

Cr‧‧‧First RF signal

Co‧‧‧ output signal

Ci‧‧‧second RF signal

Cog‧‧‧ output gain signal

En‧‧‧Enable signal

Claims (18)

An electronic device comprising: a coupler for receiving a baseband signal; a downconverter for downconverting a first RF signal to generate the baseband signal; and a noise estimation device coupled to the coupler The noise estimation device receives the baseband signal, and subtracts a predetermined synchronization preamble from the baseband signal to obtain a noise estimation signal, and the preset synchronization preamble conforms to the IEEE 802.11bg specification. And/or a transmission signal of the IEEE 802.11n specification; and a combining unit coupled to the coupler and the noise estimating device, wherein the combining unit receives the baseband signal and subtracts the noise estimate from the baseband signal Signaling to obtain an output signal; and a demodulator coupled to the combining unit, wherein the demodulator is configured to receive the output signal. The electronic device of claim 1, wherein the baseband signal is generated by down-converting a radio frequency signal when performing WiFi communication or Bluetooth communication. The electronic device of claim 1, wherein the combination unit is an adder or a subtractor. The electronic device of claim 1, further comprising a detecting device for determining whether the electronic device is connected to an external device conforming to the USB 3.0 standard, and the electronic device is connected to the external device And transmitting a coincidence signal to the noise estimating device, so that the noise estimating device subtracts the preset synchronization preamble from the baseband signal to obtain the noise estimation signal. The electronic device of claim 1, wherein the preset synchronization preamble is built in the noise estimation device. The electronic device of claim 1, wherein the combination unit is an OP amplifier or a mixer. The electronic device of claim 1, further comprising an automatic gain controller coupled to the combining unit for amplifying the output signal to obtain an output gain signal. The electronic device of claim 1, further comprising a low noise amplifier for amplifying a second radio frequency signal to generate the first radio frequency signal. The electronic device of claim 1, further comprising: a down converter for downsampling a first RF signal to generate a first baseband signal; and an automatic gain controller coupled to the And a coupler for amplifying the first fundamental frequency signal as the base frequency signal. A noise filtering method is applied to an electronic device, the noise filtering method includes: receiving a fundamental frequency signal, wherein the fundamental frequency signal is generated by down-clocking a first radio frequency signal; The baseband signal is subtracted from a preset synchronization preamble to obtain a noise estimation signal, wherein the preset synchronization preamble conforms to the IEEE 802.11bg specification and/or the IEEE 802.11n specification transmission signal; and is demodulated The noise estimation signal is subtracted from the fundamental frequency signal before the change to obtain an output signal. For example, the noise filtering method described in claim 10 of the patent application includes: Determining whether the electronic device is connected to an external device conforming to the USB 3.0 standard; transmitting the coincidence signal when the electronic device is connected to the external device; and subtracting the preset synchronization signal from the baseband signal according to the enable signal Preamble. The method for filtering noise according to claim 10, wherein the step of subtracting the noise signal from the fundamental signal to obtain an output signal is performed by an adder or a subtractor. The method for filtering noise according to claim 10, wherein the baseband signal is generated by down-converting a radio frequency signal when performing WiFi communication or Bluetooth communication. The noise filtering method of claim 10, wherein the preset synchronization preamble is built in a noise estimation device. The method of filtering noise according to claim 10, wherein the step of receiving the baseband signal and subtracting the noise signal from the baseband signal to obtain the output signal is performed by an OP amplifier or a The mixer performs. The noise filtering method of claim 10, further comprising amplifying the output signal to obtain an output gain signal. The noise filtering method of claim 10, further comprising amplifying a second radio frequency signal to generate the first radio frequency signal. The noise filtering method of claim 10, further comprising: down-converting a first radio frequency signal to generate a first baseband signal; and amplifying the first baseband signal to generate the baseband signal.